To render digital content encrypted according to a content key (KD) on a first device having a public key (PU1) and a corresponding private key (PR1), a digital license corresponding to the content is obtained, where the digital license includes the content key (KD) therein in an encrypted form. The encrypted content key (KD) from the digital license is decrypted to produce the content key (KD), and the public key (PU1) of the first device is obtained therefrom. The content key (KD) is then encrypted according to the public key (PU1) of the first device (PU1 (KD)), and a sub-license corresponding to and based on the obtained license is composed, where the sub-license includes (PU1 (KD)). The composed sub-license is then transferred to the first device.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A system for checking out a sub-license to a first device from a second device and checking in a sublicense, comprising: computing processors; and computing memory communicatively coupled with said computing processors, said computing memory having instructions stored therein for performing the following: receiving a request from the second device for a nonce, and providing such nonce; receiving from the second device the checked-out sub-license and the provided nonce; concluding that the nonce received is the same nonce provided; therefore concluding that the received sub-license is legitimate; storing the sent sub-license; adding an entry including an identifier identifying the checked-out sub-license and an identifier identifying the first device to a catalog; deleting the checked-out sub-license; requesting a nonce from the second device, and receiving such nonce; and sending to the second device the received nonce, an identifier identifying the first device, and a list of all sub-licenses currently resident on the first device, wherein the deleted checked-out sub-license is not in the sent list, and wherein the second device concludes that the nonce sent by the first device is the same nonce received by the first device, therefore concludes that the sent identifier and list that accompanied the sent nonce is legitimate, compares the sent list with the catalog and notes that the deleted checked-out sub-license is in the catalog but not on the sent list, and deletes the entry having the identifier identifying the deleted checked-out sub-license and the identifier identifying the first device from the catalog.
2. A system for checking out a sub-license from a second device to a first device and checking in the sublicense, comprising: computing processors; and computing memory communicatively coupled to said computing processors, the computing memory having stored therein instructions for performing the following: requesting a nonce from the first device, and receiving such nonce; and sending the checked-out sub-license and the received nonce to the first device, wherein the first device concludes that the nonce sent by the second device is the same nonce received by the second device, therefore concludes that the sent sub-license that accompanies the sent nonce is legitimate, and stores the sent sub-license; adding the checked-out sub-license to a catalog; wherein checking in the checked-out sub-license comprises: receiving a request from the first device for a nonce, and providing such nonce; receiving from the first device the provided nonce, an identifier identifying the first device, and a list of all sub-licenses currently resident on the first device, wherein the deleted checked-out sub-license is not in the sent list; concluding that the received nonce is the same nonce provided; therefore concluding that the received identifier and list is legitimate; comparing the received list with the catalog, and noting that the deleted checked-out sub-license is in the catalog but not on the sent list; and deleting the entry having the identifier identifying the deleted checked-out sub-license and the identifier identifying the first device from the catalog.
3. The system of claim 2 wherein adding the checked-out sub-license to the catalog comprises adding an entry including an identifier identifying the checked-out sub-license and an identifier identifying the first device to the catalog.
4. A system for checking out a sub-license from a second device to a first device and checking in the sub-license, comprising: computing processors; and computing memory communicatively coupled to said computing processors, the computing memory having stored therein instructions for performing the following: requesting, by the second device, a nonce from the first device, and receiving such nonce; sending, by the second device, the checked-out sub-license and the received nonce to the first device; concluding, by the first device, that the nonce sent by the second device is the same nonce received by the second device; therefore concluding, by the first device, that the sent sub-license that accompanies the sent nonce is legitimate; and storing, by the first device, the sent sub-license; adding, by the second device, the checked-out sub-license to a catalog; deleting the checked-out sub-license from the first device; requesting, by the first device, a nonce from the second device, and receiving such nonce; sending, by the first device to the second device, the received nonce, an identifier identifying the first device, and a list of all sub-licenses currently resident on the first device, wherein the deleted checked-out sub-license is not in the sent list; concluding, by the second device, that the nonce sent by the first device is the same nonce received by the first device; therefore concluding, by the second device, that the sent identifier and list that accompanied the sent nonce is legitimate; comparing, by the second device, the sent list with the catalog, and noting that the deleted checked-out sub-license is in the catalog but not on the sent list; and deleting, by the second device, the entry having the identifier identifying the deleted checked-out sub-license and the identifier identifying the first device from the catalog.
5. The system of claim 4 wherein adding the checked-out sub-license to the catalog comprises adding an entry including an identifier identifying the checked-out sub-license and an identifier identifying the first device to the catalog.
6. A computer readable storage medium comprising computer readable instructions for performing a method of checking out a sub-license to a first device from a second device and checking in a sublicense, the method comprising: receiving a request from the second device for a nonce, and providing such nonce; receiving from the second device the checked-out sub-license and the provided nonce; concluding that the nonce received is the same nonce provided; therefore concluding that the received sub-license is legitimate; storing the sent sub-license; adding an entry including an identifier identifying the checked-out sub-license and an identifier identifying the first device to a catalog; deleting the checked-out sub-license; requesting a nonce from the second device, and receiving such nonce; and sending to the second device the received nonce, an identifier identifying the first device, and a list of all sub-licenses currently resident on the first device, wherein the deleted checked-out sub-license is not in the sent list, and wherein the second device concludes that the nonce sent by the first device is the same nonce received by the first device, therefore concludes that the sent identifier and list that accompanied the sent nonce is legitimate, compares the sent list with the catalog and notes that the deleted checked-out sub-license is in the catalog but not on the sent list, and deletes the entry having the identifier identifying the deleted checked-out sub-license and the identifier identifying the first device from the catalog.
7. A computer readable storage medium comprising computer readable instructions for performing a method of checking out a sub-license from a second device to a first device and checking in the sublicense, the method comprising: requesting a nonce from the first device, and receiving such nonce; and sending the checked-out sub-license and the received nonce to the first device, wherein the first device concludes that the nonce sent by the second device is the same nonce received by the second device, therefore concludes that the sent sub-license that accompanies the sent nonce is legitimate, and stores the sent sub-license; adding the checked-out sub-license to a catalog; wherein checking in the checked-out sub-license comprises: receiving a request from the first device for a nonce, and providing such nonce; receiving from the first device the provided nonce, an identifier identifying the first device, and a list of all sub-licenses currently resident on the first device, wherein the deleted checked-out sub-license is not in the sent list; concluding that the received nonce is the same nonce provided; therefore concluding that the received identifier and list is legitimate; comparing the received list with the catalog, and noting that the deleted checked-out sub-license is in the catalog but not on the sent list; and deleting the entry having the identifier identifying the deleted checked-out sub-license and the identifier identifying the first device from the catalog.
8. The computer readable storage medium of claim 7 wherein adding the checked-out sub-license to the catalog comprises adding an entry including an identifier identifying the checked-out sub-license and an identifier identifying the first device to the catalog.
9. A computer readable storage medium comprising computer readable instructions for performing a method of checking out a sub-license from a second device to a first device and checking in the sub-license, the method comprising: requesting, by the second device, a nonce from the first device, and receiving such nonce; sending, by the second device, the checked-out sub-license and the received nonce to the first device; concluding, by the first device, that the nonce sent by the second device is the same nonce received by the second device; therefore concluding, by the first device, that the sent sub-license that accompanies the sent nonce is legitimate; and storing, by the first device, the sent sub-license; adding, by the second device, the checked-out sub-license to a catalog; deleting the checked-out sub-license from the first device; requesting, by the first device, a nonce from the second device, and receiving such nonce; sending, by the first device to the second device, the received nonce, an identifier identifying the first device, and a list of all sub-licenses currently resident on the first device, wherein the deleted checked-out sub-license is not in the sent list; concluding, by the second device, that the nonce sent by the first device is the same nonce received by the first device; therefore concluding, by the second device, that the sent identifier and list that accompanied the sent nonce is legitimate; comparing, by the second device, the sent list with the catalog, and noting that the deleted checked-out sub-license is in the catalog but not on the sent list; and deleting, by the second device, the entry having the identifier identifying the deleted checked-out sub-license and the identifier identifying the first device from the catalog.
10. The computer readable storage medium of claim 9 wherein adding the checked-out sub-license to the catalog comprises adding an entry including an identifier identifying the checked-out sub-license and an identifier identifying the first device to the catalog.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
June 9, 2008
May 11, 2010
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